Preparation and Characterization of Diethylene Glycol Octadecyl Ether Methacrylate and Its Polymer

doi:10.7503/cjcu20130881

Abstract

Abstract:

Diethylene glycol octadecyl ether methacrylate(DEGOEMA) as a phase change material was prepared by means of acrylation of diethylene glycol octadecyl ether sodium(C18E2Na) with methacryloyl chloride. And then poly(diethylene glycol octadecyl ether methacrylate)(PDEGOEMA) was synthesized by free radical polymerization. The molecular weight and its distribution were characterized using gel permeation chromatography(GPC). The structure, phase change properties, thermal stablility, crystal structure of the monomer and the comb-like polymer were characterized using Fourier transform infrared spectroscopy(FTIR), hydrogen nuclear magnetic resonance spectrum(¹H NMR), differential scanning calorimetry(DSC), thermogravimetric analysis(TG) and wide-angle X-ray diffraction(XRD). The results show that the novel monomer and polymers are excellent phase change materials with steady structure, high crystallinity, higher heat enthalpy and thermal stablility. Both the melting and crystallizing enthalpies of PDEGOEMA are 73 J/g. The onset melting temperature and crystallizing temperature are 41 and 36 ℃, respectively. It is thermal stable below 314 ℃. These properties indicate that this phase change material can be widely used as a polymeric phase change material in high processing and using temperature environments.

Key words: Polymeric phase change material, Comb-like polymer, Free radical polymerization, Poly(diethy-lene glycol octadecyl ether methacrylate)

CLC Number:

O631

TrendMD:

ZHANG Zhili, TANG Xiaofen, MENG Jieyun, ZHANG Xingxiang, SHI Haifeng. Preparation and Characterization of Diethylene Glycol Octadecyl Ether Methacrylate and Its Polymer[J]. Chem. J. Chinese Universities, 2014, 35(1): 175.

Figures/Tables 7

Scheme 1 Synthesis of DEGOEMA

Fig.1 FTIR spectra of C18E2(a), DEGOEMA(b) and PDEGOEMA(c)

Fig.2 1H NMR spectra of C18E2(a), DEGOEMA(b) and PDEGOEMA(c)

Fig.3 DSC curves of C18E2(a), DEGOEMA(b) and PDEGOEMA(c) in the heating and cooling process

Table 1 Thermal properties of C18E2, DEGOEMA and PDEGOEMA*

Sample	ΔH_m/(J·g^-1)	T_m/℃		ΔH_c/(J·g^-1)	T_c/℃		ΔT/℃	T_5%/℃
Sample	ΔH_m/(J·g^-1)	T_mo		T_mp			T_co	T_cp
C18E2	136	44	50	144	44	40	10	221
DEGOEMA	118	25	33	121	30	21	12	250
PDEGOEMA	73	41	44	73	36	34	10	314

Fig.4 TG curves of C18E2(a), DEGOEMA(b) and PDEGOEMA(c)

Fig.5 XRD patterns of C18E2(a), DEGOEMA(b) and PDEGOEMA(c)

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